Casing elevator



Patented Aug. 1, 1922.

2 SHEET55HEET I.

INVENTOR.

AT'TO EY B. N. YOUNGKEN.

CASING ELEVATOR.

APPLICATION FILED AUG-30,1920.

1 ,424,54;8, Patented Aug. 1, 1922.

2 SHEETS-SHEET 2.

f INVENTOR.

BY A

ATTbR EY Q prises a substantially U-shaped casin PATENT OFFICE.

BEN N. 'YOUNGKEN OF L08 ANGELES, CALIFORNIA.

CASING ELEVATOR.

pecification of Letters Patent.

Patented Aug. 1, 1922.

Application filed August 80 1920. Serial No. 406,910.

To all whom it may concern Be it known that I, BEN N. YoUNoKnN, acitizen of the United States, residing at Los Angeles, in the county ofLos Angeles and State of California, have invented a new and usefulCasing Elevator, of which the following is a s ecification.

This invention re ates to casin elevators and is particularly directedto the type of elevators generally employed for raising, lowering orsupporting we I casings, sucker rods or pump tubing.

An object of the invention is to provide an elevator which is of simpleand durable construction, which can be easily and quickl manipulated,and which will elficiently fl} fill all the requirements of heavy dutyservice demanded of devices of this character.

Another object is to provide a two part hingedly united elevator havinga latch for the gate which is positively retained in latching positionby a shoulder or coupling of the casing or rod engaged by the elevator.

Another object is to provide a safety pawl which is associated with thelatch and which must be released before the latch can be disengaged fromthe gate.

Another object is to maintain a smooth unbroken upper surface of theelevator.

Various other objects and advanta s will be more fully apparent from theollowing description of the accom anying drawings, which form a part oft is disclosure, and which illustrate a preferred form of embodiment ofthe invention.

Of the drawings:

Figure 1 is a top plan view.

Fig. 2 is a front elevation.

Fig. 3 is an enlarged detail section on line :v-w of Fig. 1.

Fig. 4' is a perspective view of one end of the body, showing recess andthe spring receiving recess thereof.

Fig. 5 is a detail perspective view of the gate latch, lookin at itsunder side; and

Fig. 6 is a detail perspectiveview of the safety pawl.

The body portion of the elevator com- 2 the med l w a e n r u face 6 atwh h:

the latch receiving adapted to engage the casin or rod to which theelevator is applied. iametrically opposed ears 4-4 extend outwardly fromthe body and are provided with transverse orifices 5-5 to receive thebails 6-6 which may be of any of the many well known types. Tofacilitate a lateral removal of the bails I provide removable blocks 7-7forming the outer walls of said orifices, each held in place by a bolt 8extending vertically through the respective ear 4.- and .the block.

Adjacent one end of the concave surface of the bodyI provide bearings9-9 roecting laterally and relatively space to form a suitable openingto receive a hinge bearing 10 of a gate 11 which is journaled to swingon a pivot pin 12. The inner concave surface 13 of the gate is curved toconform to the surface 3 of the body and when the gate is closedregisters therewith to form a vertical concentric bore adapted toclosely embrace the object to which the elevator is applied. The freeend of the gate has a lateral tongue 14 which engages and rests upon ashelf 15 on the body, when the gate is in closed position.

T e gate 11 is latched in closed position by a ate latch 17 which ispositioned or embed ed in a recess 18 formed in the upper surface of thebody and is pivoted to swing vertically on a pivot pin 19. The hook nose20 of thelatch 17 e ges over the tongue 14 of the te to late the gate inclosed position. positioned within a recess 22 in the body with one endengagin a stud 24 on the body and the other en engaging a pin 25 on thelatch, said ring exerting a normalizing tension on iiiie latch.

To positively maintain the latch 17 in latching position when theelevator is in use, I provide said latch with a lateral lug 26 whichextends laterally in the recess 18 to a point approximately flush withthe concave surface 3 of the body. When the elevator engages a casing,the shoulder or coupling thereof will engage the lug 26 and maintain thegate late 17 against unlatch, j movement.

latch spring 21 is forms an approximate half circle and is a pawl 30 hasa transverse opening 34 positioned concentric to the plvot pin 31 and astop stud 35 carried by the latch 17 extends through said opening. Apawl sprin 36 in the opening 34 engages the stud 35 an the opposite endof the wall of the opening and tends to yieldingly maintain said paw innormal position, the stud 35 serving to limit the movement of the pawl.

The outer end of the pawl has lateral flan s 37 formin stops limitingthe upwar movement o the pawl relative to the latch and also providingan extended surface to facilitate a convenient manipulation.

With the gate closed and the nose 20 of the latch 17 engaged over thetongue of the gate, as shown in Fig. 3, the gate will be maintained inclosed position, and the nose 32 of the safety pawl 30, engaging withinthe recess 33 of the gate tongue 14, will prevent a vertical releasingmovement of the latch. To releam the gate it is first necessary to raisethe safety pawl upwardly, to the position indicated in dotted lines inFig. 3, to withdraw its hook nose 32 horizontally from the recess 33,after which the gate latch 17 may be raised outof engagement with theate tongue. This operation may be accomp ished in a single movement bypressing upwardly upon the under surface of the free end of the pawl 30,the first part of the movement disengaging the pawl and bringing its stoflan 37 against the outer end of the late 17 and a continuation of themovement-carrying the latch and pawl upwardly free of the to.

y This construction of gate atch and safet awl rovides a double orcompound late in which the vertically movable latch functions to retainthe gate in closed position and the horizontally movable pawl functionsto maintain the latch against accidental displacement, or verticalmovement. This contributes to a safe operation of the elevator andprovides a structure which will maintain its effective functions evenwhen the parts become considerably worn through lonIg and severe usage.

' claim:

1. An elevator of the character described compr ing two members hingedlyunited, in vertlcally mo able latch pivoted op one member and enga ingthe other member to maintain the mem ers in closed relation, and a pawlpivoted on the latch and engaging one of said members to maintain thelatch against vertical movement, the pawl being adaped to swinghorizontally ina latch releasing movement.

2. An elevator of the character described comprising a body and 9. atehinged thereto to swing horizontally, t e gate having a horizontalabutment, a vertically movable latch ivoted on the body and having ahook end a apted to engage over the free end of the gate to maintain itclosed, and a pawl pivoted on the latch and adapted to engage eneath theabutment to maintain the latch against vertical gate releasing movement.

3. An elevator of the character described comprising a body and a gatehingedly united, and a compound latch pivoted on the body and having amember adapted to engage over the free end of the gate and a secondmember cooperating with the gate to maintain the first member inlatching engagement.

4. An elevator of the character described comprising a body and a gatehingedly united, a spring operated latch carried by the body andadaptedto engage the free end of the gate to maintain it in closed position,and a spring operated pawl adapted to engage the gate to retain thelatch against movement.

5. An elevator of the character described comprising a body and a gatehingedly united, a latch pivoted on the body and having a hook noseadapted to engage the free end of the gate, said latch having abifurcated free end, and a pawl positioned between the furcations of thelatch and ivoted thereto, said pawl cooperating witli the gate tomaintain the latch against movement.

6. An elevatgr of the character described comprising a body and a gatehingedly united, means for maintaining the gate in closed position, anda second means carried by the first named means and cooperating with theate to maintain said first means against a gate releasing movement.

7 An elevator of the character described comprising a body and a gatehingedly united, the te having an abutment, and a compound atch pivotedon the body and having a member adapted to engage over the free end ofthe gate to maintain it closed and a second member adapted to engagesaid abutment to maintain the first member against a gate releasingmovement:

8. An elevator of the character described comprising a body and a gatehingedly united, a vertically movable latch pivoted on the body and engaing the free end of the gate to maintain t e ate in closed pos ti n, anda pawl pivots. n the l tch and engaging the gate to maintain the latchend of said member and having a laterally against vertical gatereleasing movement, the extended hook nose. 10 pawl being adapted to beswung horizontally Signed at Los Angeles, California this 23d to releasethe latch. day of August 1920.

9. A latch device for well elevators com- BEN N. YOUNGKEN. prisinga'latch member having a fulcrum Witnesses: and 'a downwardly extendinghook nose at CLARENCE B. Fos'rnn,

its free end, and a pawl carried by the free L. BELLE WEAVER.

